Plug-in attachment



DI P4 jl Fu,

y PLUG-IN ATTACHMENT. APPLICATION FILED MAY 21, 1921.

1 ,417,649, Patentd May 30,' 1922.

f UNITED s'rA'rEs PATENT orifice.

DELAVERGNE P. WILLIAMS AND Joint F, WILLIAMS, or SANDUSKY, omo.

.-rLUG-IN. ankommen appucation med may 21,

To all whom t may concern.'

Be it known that we, DELAVERGNE P. WIL- LIAMs and JOHN F. W1LLiAMs,=citizens of the United States, residingat Sandusky, in the county of Erieand State of Ohio, have invented a certain new and useful Improvement in Plug-In Attachments, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings. l V

This invention relates to electrical' plugin attachments which while capable ofmanyl uses are directed'particularly-for use in radio circuits.

Some of the objects ofthe presentimiention are to provide a combined plug-and condenser which shall be particularly useful in radio circuits lwhere it. is often desirable to plug the head-receivers 'or other apparatus in the circuit at various stages of amplification or at different points in the circuit; to`provide a device of the aforesaid character which shall be simple in construction and inexpensive to manufacture, while further objects and advantages will appear .as the description proceeds.,

In the accompanying drawing whereinwe have shown certain forms of our invention Fig. 1 is a vertical sectional view of acombined plug and condenser; Fig. 2 is a similar. viewof a modified form of combinedplug and condenser-wherein the condenser is of the vvariable type; Fig. 3 isv an end elevation thereof; Fig. 4- is a vertical sectional view of a combined plug, condenser and telephone receiver, and Fig. 5 is a similar .view of a modified form. wherein the plug and condenser are detachably connected to the receiver.

Describing by reference charactersthe varions parts illustrated and referring particularly to Fig. 1, 10 indicates the metallic body portion of the plug which is reduced in diameter at one end thereof as indicated at 11 :to form one contact surface. The other contact is formed by a rod 12. disposed within an insulating sleeve 13 which is fitted into a bore 14 extending through the contact 11.

The body portion 10 of theplug lscut away as indicated at 16 to form a recess therein for a small condenser indicated at 17 andalso to perm-it the lead in wires 18 to be connected to the condenser and contacts. The condenser 17 is usually of small capacity and may .be formed from a plurality of alvSpecification oflettersliatent.

Iindicated ,formed by takingofi' taps at various points thereacross. A

Patentedy May 30,4 1922. 1 921. serial Nc. 471,416.

ternate sheets of a conductor and a suitable dielectric laid, one upon the other and each of a slze to lfit 1n said recessior/ may be formed of a plurality of larger sheets of a dielectric and a conductor which are rolled and pressed.`

ed acrosstheseicontacts which is the usual connection for use in radio'circuits when the plug is attached to the end y phone. cord.- A suitable sleeve 19 lformed from lnsulating material is fitted over the body portion 10 and closes the recess 16.

InFig. 2 we have shown a modified form of combinedv plug and condenser wherein the condenser is of the variable t pe. In this view 20 indicates a receptac e preferably formed of insulating material and provided with a removable cover `21' and a sleeve 22 projecting` from the opposite side of-said receptacle. A metallic sleeve 23 is fitted over the. sleeve `22 and forms one contact and a rod 24 disposed within the sleeve 22 servesy as the other contact. The variable condenser at 25 may be of a typewhich is of a fixed condenser and connecting said taps to suitable contacts 26 which are mounted on the cover 21. t A fan blade 4switch 2 7 is mounted on the ceiver, condenser and plug. In this form the'receiver shell 30 is formed withay projection 31 to house the condenser 32 and a still further projection 33 of said insulating material serves to separate the contacts 34 and '35. The telephone is connected to the aforesaidcontacts andthe condenser is shunted device of this type is particularly compact and useful as a loud speaker for radio circuits and may be easily inserted inv the circuit at any desired point where the head receivers would ordinarily be plugged in. 'i

In Fig. 5 we have shown a modified form of combined receiver, condenser and plug wherein the housing 31a is detachably connected to the receiver shell 30vl in any suitable manner, as by means of the bayonet type and contacts 34a and 35a are each connected es cover and yby rotating thel vhandle 28, lsaid switch will contact with any to the spring pressed pins 38 and said pins Contact with' stationary vpins 39 Which in turn are connected to the terminals of the telephone receiver. With this arrangement the receiver may be used as a loud speaker or may be detached from the plug and condenserand used With a head band in the ordinary manner.. f

Having thus described our invention, what We claim is :4 l

1. The combination with a plug comprising a body portion having a pair of contacts projecting therefrom, of a condenser arranged Within said body portion and in electrical circuit'with said contacts. f

2. The combination with a plug comprising a body portion havinga pair of contacts projecting therefrom, of a condenser carried by said body portion and in electrical circuit with said contacts.

- 3. lIlhe combination With ay plug compris-v ing a body portion having a pair of contacts projecting therefrom of a condenser arranged within said body portion and shunted across said contacts.

4. The combination 'with a vplug'coinpri'sing a body portion having a pair of contacts projecting therefrom, 0f a condenser arran trical instrument rmounted on the body portion of said plug and in electrical Acircuit with said contacts and condenser.

ged Within said body portion and in electrical circuit with said contacts and an. elec--v 5. The combination with a plug comprising a body portionhaving apai'r of contacts projectingtherefrom, of an electrical instrument mounted on the body portion of said plug and in electrical circuit with said contacts.

6. The combinationwith a plug comprising a body portion having a pair of contacts' projecting therefrom, a condenser arranged in said body portion and in lelectrical circuit with said contacts, and a telephone receiver mounted on said body portion and in electrical circuit with lsaid contacts and condenser.'

7 The combination vvith a` plug comprising a body portion having a pair of contacts projecting therefrom, a condenser arranged in said body portion and in electrical circuit with said contacts andan electrical instrument detachably connected to said lbody portion and adapted to be electrically connected With said contacts.

8. The combination with a plug comprising a body portion having a pair of contacts projecting therefrom, of an electrical instrument detachably connected to said portion and adapted to be connected in electrical circuit With said contacts.

In testimony whereof, We hereunto affix our signatures.

DELAVERGNE P. WILLIAMS. JOHN F. WILLIAMS. 

